First part of the story is when Thomas was being all cocky and said "jumping over the pole is super easy" so Mattis asked him to put his money where his mouth is.
Then he jumped approximately 6'6 feet like he wasn't even trying and started to jump all the way up to 7'0 feet. After that Mattis took Thomas to the jumping to the jumping coach and Mattis told him he has found a 7'0 high jumper.
Once Mattis took Thomas to the jumping coach he couldn't believe it was true and had to tell the tournament director that to make a last minute change in his roster.
It is Thomas first Track Meet and he jumped his way to the finals with no effort while the other jumpers where known while Thomas was not that known in the jumping community.
After Thomas won in the biggest track tournament in the world Thomas was asked to be examined for how he can jump so high. He was examined by a doctor from japan and a University professor to study on how Thomas's Achilles Tendon and what makes Thomas and Holmes Jump so high.
They then found out that it was there Achilles Tendon that was making Thomas and Holmes jump so high. They figured that the longer the Achilles Tendon and the longer it is compressed there is a higher chance that person will jump super high.